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Reserve for Property-Liability Insurance Claims and Claims Expense (Details 3)
$ in Millions
Dec. 31, 2016
USD ($)
claim
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Increase (decrease) in claims and claims expense          
Liabilities for claims and claim adjustment expenses, net of reinsurance $ 19,066        
Auto          
Increase (decrease) in claims and claims expense          
Incurred claims and allocated claim adjustment expenses, net of reinsurance 62,071        
Cumulative paid claims and allocated claims adjustment expenses, net of reinsurance 50,277        
All outstanding liabilities before 2012, net of reinsurance 1,167        
Liabilities for claims and claim adjustment expenses, net of reinsurance 12,961        
Auto | Accident Year 2012          
Increase (decrease) in claims and claims expense          
Incurred claims and allocated claim adjustment expenses, net of reinsurance 11,015 $ 11,046 $ 11,079 $ 11,187 $ 11,299
IBNR reserves plus expected development on reported claims $ 444        
Cumulative number of reported claims | claim 5,801,971        
Cumulative paid claims and allocated claims adjustment expenses, net of reinsurance $ 10,571 10,251 9,660 8,760 6,818
Auto | Accident Year 2013          
Increase (decrease) in claims and claims expense          
Incurred claims and allocated claim adjustment expenses, net of reinsurance 11,204 11,273 11,269 11,329  
IBNR reserves plus expected development on reported claims $ 888        
Cumulative number of reported claims | claim 5,890,375        
Cumulative paid claims and allocated claims adjustment expenses, net of reinsurance $ 10,316 9,770 8,826 6,662  
Auto | Accident Year 2014          
Increase (decrease) in claims and claims expense          
Incurred claims and allocated claim adjustment expenses, net of reinsurance 12,121 12,220 12,166    
IBNR reserves plus expected development on reported claims $ 1,603        
Cumulative number of reported claims | claim 6,335,312        
Cumulative paid claims and allocated claims adjustment expenses, net of reinsurance $ 10,518 9,586 7,312    
Auto | Accident Year 2015          
Increase (decrease) in claims and claims expense          
Incurred claims and allocated claim adjustment expenses, net of reinsurance 13,466 13,521      
IBNR reserves plus expected development on reported claims $ 2,963        
Cumulative number of reported claims | claim 6,754,829        
Cumulative paid claims and allocated claims adjustment expenses, net of reinsurance $ 10,503 8,027      
Auto | Accident Year 2016          
Increase (decrease) in claims and claims expense          
Incurred claims and allocated claim adjustment expenses, net of reinsurance 14,265        
IBNR reserves plus expected development on reported claims $ 5,896        
Cumulative number of reported claims | claim 6,572,689        
Cumulative paid claims and allocated claims adjustment expenses, net of reinsurance $ 8,369        
Homeowners          
Increase (decrease) in claims and claims expense          
Incurred claims and allocated claim adjustment expenses, net of reinsurance 18,251        
Cumulative paid claims and allocated claims adjustment expenses, net of reinsurance 16,577        
All outstanding liabilities before 2012, net of reinsurance 187        
Liabilities for claims and claim adjustment expenses, net of reinsurance 1,861        
Homeowners | Accident Year 2012          
Increase (decrease) in claims and claims expense          
Incurred claims and allocated claim adjustment expenses, net of reinsurance 3,891 3,913 3,930 3,915 3,833
IBNR reserves plus expected development on reported claims $ 63        
Cumulative number of reported claims | claim 1,003,156        
Cumulative paid claims and allocated claims adjustment expenses, net of reinsurance $ 3,828 3,802 3,742 3,606 $ 2,942
Homeowners | Accident Year 2013          
Increase (decrease) in claims and claims expense          
Incurred claims and allocated claim adjustment expenses, net of reinsurance 3,135 3,156 3,163 3,091  
IBNR reserves plus expected development on reported claims $ 97        
Cumulative number of reported claims | claim 682,525        
Cumulative paid claims and allocated claims adjustment expenses, net of reinsurance $ 3,038 2,991 2,878 $ 2,283  
Homeowners | Accident Year 2014          
Increase (decrease) in claims and claims expense          
Incurred claims and allocated claim adjustment expenses, net of reinsurance 3,646 3,644 3,600    
IBNR reserves plus expected development on reported claims $ 172        
Cumulative number of reported claims | claim 764,101        
Cumulative paid claims and allocated claims adjustment expenses, net of reinsurance $ 3,474 3,358 $ 2,730    
Homeowners | Accident Year 2015          
Increase (decrease) in claims and claims expense          
Incurred claims and allocated claim adjustment expenses, net of reinsurance 3,615 3,565      
IBNR reserves plus expected development on reported claims $ 323        
Cumulative number of reported claims | claim 717,025        
Cumulative paid claims and allocated claims adjustment expenses, net of reinsurance $ 3,293 $ 2,584      
Homeowners | Accident Year 2016          
Increase (decrease) in claims and claims expense          
Incurred claims and allocated claim adjustment expenses, net of reinsurance 3,964        
IBNR reserves plus expected development on reported claims $ 1,020        
Cumulative number of reported claims | claim 755,683        
Cumulative paid claims and allocated claims adjustment expenses, net of reinsurance $ 2,944